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He concluded that r/K theory was a once useful heuristic that no longer serves a purpose in life history theory.More recently, the panarchy theories of adaptive capacity and resilience promoted by C. Holling and Lance Gunderson have revived interest in the theory, and use it as a way of integrating social systems, economics and ecology.In scientific literature, r-selected species are occasionally referred to as "opportunistic" whereas K-selected species are described as "equilibrium".In stable or predictable environments, K-selection predominates as the ability to compete successfully for limited resources is crucial and populations of K-selected organisms typically are very constant in number and close to the maximum that the environment can bear (unlike r-selected populations, where population sizes can change much more rapidly).Eventually a new equilibrium is approached (sometimes referred to as a climax community), with r-strategists gradually being replaced by K-strategists which are more competitive and better adapted to the emerging micro-environmental characteristics of the landscape. Rushton's work resulted in him developing "differential k theory" to attempt to explain many variations in human behavior across geographic areas, a theory which has been criticized by many other researchers.Traditionally, biodiversity was considered maximized at this stage, with introductions of new species resulting in the replacement and local extinction of endemic species. In 1981, a review of the r/K selection literature by Parry demonstrated that there was no agreement among researchers using the theory about the definition of r- and K-selection, which led him to question whether the assumption of a relation between reproductive expenditure and packaging of offspring was justified.
That said, the dating market for older singles isn’t all that easy. There just aren’t that many available singles our age and the ones who are available are an interesting lot (read Anne Lamott’s funny take of her year on to understand).
The terminology of r/K-selection was coined by the ecologists Robert Mac Arthur and E. Thus, the equation relates the growth rate of the population N to the current population size, incorporating the effect of the two constant parameters r and K.
(Note that decrease is negative growth.) The choice of the letter K came from the German Kapazitätsgrenze (capacity limit), while r came from rate.
Here’s what’s happened in the past year — two girlfriends have gotten engaged, and one has her condo on the market and is looking with her boyfriend to buy a new place and move in together. So, because of that and the fact that we live longer, she says, it’s worth putting the time and energy into looking for love regardless of your age.
They are all 50-something, empty-nesters and divorced. The difference between men and women at this age, however, is that we don’t necessarily want the same things.